package com.ldx;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @author lidexin
 * @create 2021-09-20 15:31
 * A执行完调用B，B执行完调用C，C执行完调用A
 */
public class C {
    public static void main(String[] args) {
        Data3 data = new Data3();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                data.printlnA();
            }
        } ,"A").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                data.printlnB();
            }
        } ,"B").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                data.printlnC();
            }
        } ,"C").start();

    }
}

class Data3 { //资源类 Lock
    private Lock lock = new ReentrantLock();
    private Condition condition1 = lock.newCondition();
    private Condition condition2 = lock.newCondition();
    private Condition condition3 = lock.newCondition();

    //1A 2B 3C
    private int number  = 1;

    public void printlnA() {
        lock.lock();
        try {
            //业务，判断-> 执行 -> 通知
            //业务，判断-> 执行 -> 通知
            while (number!=1) {
                //等待
                condition1.await();
            }
            System.out.println(Thread.currentThread().getName()+"=>AAAAA");
            //唤醒，唤醒指定的人
            number = 2;
            condition2.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }

    }
    public void printlnB() {
        lock.lock();
        try {
            //业务，判断-> 执行 -> 通知
            while(number!=2) {
                condition2.await();
            }
            System.out.println(Thread.currentThread().getName()+"=>BBBBB");
            //唤醒，唤醒指定的人
            number = 3;
            condition3.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void printlnC() {
        lock.lock();
        try {
            //业务，判断-> 执行 -> 通知
            while (number!=3) {
                //等待
                condition3.await();
            }
            System.out.println(Thread.currentThread().getName()+"=>CCCCC");
            //唤醒，唤醒指定的人
            number = 1;
            condition1.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

}
